Self-closing packaging box

ABSTRACT

The present disclosure discloses a self-closing packaging box. When one end of a box body needs to be sealed, each of a first inner lining board, a second inner lining board, and a third inner lining board cover the one end of the box body, then one or more first connectors are changed to a folded position and inserted into the box body through one or more first insertion holes, so that a first board finally covers the one end of the box body, and finally the one or more first connectors are automatically unfolded to be in an unfolded position to be clamped to the one or more first insertion holes to perform a self-closing function.

RELATED APPLICATIONS

This application is a continuation of and claims priority to PCT patent application number PCT/CN2019/072963, filed on Jan. 24, 2019, which claims priority to Chinese patent application number 201811295277.6, filed on Nov. 1, 2018. PCT patent application number PCT/CN2019/072963 and Chinese patent application number 201811295277.6 are incorporated herein by reference.

FIELD OF THE DISCLOSURE

The present disclosure relates to a field of packaging, and in particular to a self-closing packaging box.

BACKGROUND OF THE DISCLOSURE

There exists packaging boxes, especially packaging cartons, of which openings are sealed by an adhesive tape. The packaging cartons all have a common feature: when the sealed packaging cartons need to be opened, auxiliary tools such as keys, knives, metal objects, etc. are used to break a seal to enable the packaging cartons to be opened. Residue (i.e., glue) of the adhesive tape often attaches to the auxiliary tools, which affects the use of the auxiliary tools. Moreover, the packaging cartons, which have been wrapped with the adhesive tape, cannot be recycled many times. The material of the adhesive tape is not easily degradable, and the glue of the adhesive tape is pollution-carrying. The packaging cartons may cause great environmental damage during post-processing.

In view of this, it is necessary to provide packaging cartons that do not require the use of adhesive tape, are environmentally friendly, can be recycled, have a simple structure, and are convenient and quick to unpack.

BRIEF SUMMARY OF THE DISCLOSURE

The present disclosure provides a self-closing packaging box to solve the deficiencies in the background.

In order to solve the technical problem, a first technical solution of the present disclosure is as follows.

A self-closing packaging box comprises a box body, a first box cover, and a second box cover, and the first box cover and the second box cover respectively cover two ends of the box body. The box body comprises a first side board, a second side board, a third side board, and a fourth side board, which are sequentially connected. The first box cover comprises a first board, a first inner lining board, a second inner lining board, and a third inner lining board, which are respectively connected to a first end of the first side board, a first end of the second side board, a first end of the third side board, and a first end of the fourth side board. The first board is disposed with one or more first connectors, and the one or more first connectors are configured to be changed between an unfolded position and a folded position. At least one of the first inner lining board, the second inner lining board, or the third inner lining board comprises one or more first insertion holes configured to be matched with the one or more first connectors when the one or more first connectors are in the folded position. When a first end of the two ends of the box body is to be sealed, each of the first inner lining board, the second inner lining board, and the third inner lining board are configured to cover the first end of the box body, the one or more first connectors are then configured to be changed to the folded position and inserted into the box body through the one or more first insertion holes so that the first board covers the first end of the box body, and the one or more first connectors are automatically unfolded to the unfolded position to be clamped to the one or more first insertion holes to perform a self-closing function.

In a preferred embodiment, the one or more first connectors are two first connectors, and the two first connectors are respectively disposed on a left side and a right side of the first board. The one or more first insertion holes are two first insertion holes, a first of the two first insertion holes is disposed between the first inner lining board and the first side board, and a second of the two first insertion holes is disposed between the third inner lining board and the fourth side board. Two first space-providing grooves are respectively disposed on a left end and right end of the second inner lining board, and the two first space-providing grooves respectively correspond to the two first insertion holes.

In a preferred embodiment, the one or more first connectors is a first connector, and the first connector is disposed on a top edge of the first board. The one or more first insertion holes is a first insertion hole, the first insertion hole is disposed between the second inner lining board and the third side board, a first of two first space-providing grooves is disposed between the first inner lining board and the second side board, and a second of the two first space-providing grooves is disposed between the third inner lining board and the fourth side board. When the two first space-providing grooves are disposed opposite to each other, the two first space-providing grooves each correspond to the first insertion hole.

In a preferred embodiment, each of the one or more first connectors comprises a first connector body and a first folding portion fixedly connected to a side of the first connector body, and each of the one or more first insertion holes is L-shaped and has a long side section and a short side section. When the one or more first connectors are in the folded position, the first connector body and the first folding portion define an L-shaped structure, the long side section of a corresponding one of the one or more first insertion holes corresponds to the first connector body, and a short side section of a corresponding one of the one or more first insertion holes corresponds to the first folding portion.

In a preferred embodiment, a width of the short side section of each of the one or more first insertion holes is shorter than a width of the first folding portion when the first folding portion is unfolded.

In a preferred embodiment, the one or more first connectors have a shape of a cube, a cuboid, a sphere, a triangle, a trapezoid, or a combination of these shapes.

In a preferred embodiment, one or more unlocking holes are disposed on at least one of the first side board, the second side board, the third side board, or the fourth side board, the number of the one or more unlocking holes is the same as at least one of the number of the one or more first connectors or the number of the one or more first insertion holes, and the one or more unlocking holes respectively correspond to the one or more first insertion holes.

In a preferred embodiment, the one or more unlocking holes are disposed with a connecting piece, and the one or more unlocking holes and the connecting piece are connected by a point-breaking structure.

In a preferred embodiment, the second box cover comprises a second board, a sixth inner lining board, a seventh inner lining board, and an eighth inner lining board, which are respectively connected to a second end of the third side board, a second end of the fourth side board, a second end of the first side board, and a second end of the second side board. The second board is disposed with one or more second connectors, and the one or more second connectors are configured to be changed between the unfolded position and the folded position. At least one of the sixth inner lining board, the seventh inner lining board, or the eighth inner lining board comprises one or more second insertion holes configured to be matched with the one or more second connectors when the one or more second connectors are in the folded position. When a second end of the two ends of the box body is to be sealed, each of the sixth inner lining board, the seventh inner lining board, and the eighth inner lining board are configured to cover the second end of the box body, the one or more second connectors are then configured to be changed to the folded position and inserted into the box body through the one or more second insertion holes so that the second board covers the second end of the box body, and the one or more second connectors are automatically unfolded to the unfolded position to be clamped to the one or more second insertion holes to perform the self-closing function.

In a preferred embodiment, the one or more first connectors is a first connector, and the first connector is disposed on a top edge of the first board. The one or more first insertion holes is a first insertion hole, and the first insertion hole is disposed on the second inner lining board. A sum of widths of the first inner lining board and the third inner lining board is shorter than a length of the third side board, and a space is defined between the first inner lining board and the third inner lining board and corresponds to the first insertion hole.

In a preferred embodiment, the first connector comprises a first connector body and a first folding portion connected to a side of the first connector body. The first insertion hole is linear-shaped. When the first connector is in the folded position, the first connector body and the first folding portion define a linear-shaped structure.

In a preferred embodiment, the first connector body is fixedly connected to the top edge of the first board, and the first folding portion is not connected to the first board to define a free end.

In a preferred embodiment, the first connector body is fixedly connected to the first board, and the first folding portion is not connected to the first board to define a free end.

A second technical solution of the present disclosure is as follows.

A self-closing packaging box comprises a box body, a first box cover, and a second box cover, and the first box cover and the second box cover respectively cover two ends of the box body. The box body comprises a first side board, a second side board, a third side board, and a fourth side board, which are sequentially connected. The first box cover comprises a first board, a first inner lining board, a second inner lining board, and a third inner lining board, which are respectively connected to a first end of the first side board, a first end of the second side board, a first end of the third side board, and a first end of the fourth side board. The first board is disposed with one or more first connectors, and the one or more first connectors are configured to be changed between an unfolded position and a folded position. At least one of the second side board, the third side board, or the fourth side board comprises one or more first insertion holes configured to be matched with the one or more first connectors when the one or more first connectors are in the folded position. When a first end of the two ends of the box body is to be sealed, each of the first inner lining board, the second inner lining board, and the third inner lining board are configured to cover the first end of the box body, the one or more first connectors are then configured to be changed to the folded position and inserted into the box body through the one or more first insertion holes so that the first board covers the first end of the box body, and the one or more first connectors are automatically unfolded to the unfolded position to be clamped to the one or more first insertion holes to perform a self-closing function.

Compared with the existing techniques, the technical solution has the following advantages.

1. When one end of the box body needs to be sealed, it is only necessary that each of the first inner lining board, the second inner lining board, and the third inner lining board cover the end of the box body, then the one or more first connectors are changed to the folded position and inserted into the box body through the one or more first insertion holes so that the first board covers the one end of the box body, and finally the one or more first connectors are automatically unfolded to the unfolded position to be clamped to the one or more first insertion holes to perform the self-closing function. At this time, the user does not need to use an adhesive tape to seal the self-closing packaging box, which is environmentally friendly. At the same time, the self-closing packaging box has the self-closing function. When the self-closing packaging box is sealed, the self-closing packaging box cannot be opened without being damaged, which ensures an integrity of the goods in the self-closing packaging box, especially in a delivery industry. When the buyer receives the goods, if the self-closing packaging box is intact, it can be determined that the goods are intact (i.e., have not be touched). If the self-closing packaging box shows signs of opening or is damaged, it can be determined that the self-closing packaging box has been opened.

2. When the one or more first insertion holes are L-shaped, a width of the short side section of the one or more first insertion holes is shorter than a width of the first folding portion of the first connector when the first folding portion is unfolded, so that the first folding portion can be clamped on a bottom wall of the one or more first insertion holes after being unfolded. The first board cannot be opened from the outside of the self-closing packaging box, so the self-closing packaging box cannot be opened.

3. Two first connectors are respectively disposed on a left side and a right side of the first board, and two first insertion holes are respectively disposed on the first inner lining board and the third inner lining board. The two first connectors are matched with the two first insertion holes so that the self-closing function is more stable and not easily damaged.

4. One or more unlocking holes are provided. The number of the one or more unlocking holes is the same as the number of the one or more first insertion holes, and the one or more unlocking holes respectively correspond to the one or more first insertion holes. The first folding portion is folded by a finger of a user that is moved into the one or more unlocking holes, and the one or more first connectors are pulled out of the one or more first insertion holes so as to open the one end of the box body. Therefore, there is no need to destroy the self-closing packaging box when opening the box, and the self-closing packaging box can be reused once unpacked.

5. The one or more unlocking holes are disposed with a connecting piece. The connecting piece and the one or more unlocking holes are connected by a point-breaking structure such that the connecting piece and the unlocking hole are separated by the point-breaking structure when the self-closing packaging box is open. At this time, the finger of the user can perform an operation of unpackaging through the one or more unlocking holes. Thereby, an integrity of the self-closing packaging box which is unpackaged can be ensured.

6. The second box cover is the same as the first box cover to ensure a self-closing effect.

BRIEF DESCRIPTION OF THE DRAWINGS

The present disclosure will be further described below with reference to the drawings and embodiments.

FIG. 1 illustrates an overall perspective view of a self-closing packaging box according to a first embodiment.

FIG. 2 illustrates a first perspective view of the self-closing packaging box according to the first embodiment when a first box cover is open.

FIG. 3 illustrates a second perspective view of the self-closing packaging box according to the first embodiment when the first box cover is open.

FIG. 4 illustrates a perspective view of the self-closing packaging box according to the first embodiment when a second box cover is open.

FIG. 5 illustrates a perspective view of the self-closing packaging box according to the first embodiment when two second connectors and two second insertion holes are matched with each other in a folded position.

FIG. 6 illustrates a perspective view of the self-closing packaging box according to the first embodiment when the self-closing packaging box is unpackaged and a first connector is separated from a first insertion hole.

FIG. 7 illustrates an overall perspective view of a self-closing packaging box according to a second embodiment.

FIG. 8 illustrates a perspective view of the self-closing packaging box according to the second embodiment when the first box cover is open.

FIG. 9 illustrates a perspective view of the self-closing packaging box according to the second embodiment when the self-closing packaging box is unpacked, the first connector is separated from the first insertion hole, and the second connector is separated from the second insertion hole.

FIG. 10 illustrates a perspective view of the self-closing packaging box according the second embodiment when the second box cover is open.

FIG. 11 illustrates a perspective view of a self-closing packaging box according a third embodiment when two first connectors and two first insertion holes are matched with each other.

FIG. 12 illustrates a perspective view of the self-closing packaging box according to the third embodiment when the first box cover is open.

FIG. 13 illustrates a perspective view of the self-closing packaging box according to the third embodiment when the second box cover is open.

FIG. 14 illustrates a perspective view of a self-closing packaging box according to a fourth embodiment when the first box cover and the second box cover are both open.

FIG. 15 illustrates a perspective view of the self-closing packaging box according to the fourth embodiment when the first connector and the first insertion hole are matched with each other.

FIG. 16 illustrates a perspective view of the self-closing packaging box according to the fourth embodiment when the first box cover and the second box cover are closed.

DETAILED DESCRIPTION OF THE EMBODIMENTS

The present disclosure will be further described below in combination with the accompanying drawings and embodiments.

Referring to FIGS. 1 to 6, a self-closing packaging box 1000 of a first embodiment is provided. The self-closing packaging box 1000 comprises a box body 1100, a first box cover 1200, and a second box cover 1300. The first box cover 1200 and the second box cover 1300 respectively cover two ends of the box body 1100.

Referring to FIG. 1, the self-closing packaging box 1000 has a rectangular, parallelepiped structure. Alternatively, the self-closing packaging box 1000 may also be a cube, a triangle, a cylinder, or a combination of these shapes. The color of the self-closing packaging box 1000 can be red, orange, tan, brown, yellow, green, cyan, blue, purple, gray, pink, black, white, brown, or a combination of these colors, but is not limited in this regard.

The box body 1100 comprises a first side board 10, a second side board 20, a third side board 30, and a fourth side board 40, which are sequentially connected. In some embodiments, the first side board 10, the second side board 20, the third side board 30, and the fourth side board 40 are sequentially connected to define a rectangular, parallelepiped frame.

The first box cover 1200 comprises a first board 100, a first inner lining board 200, a second inner lining board 300, and a third inner lining board 400, which are respectively connected to a first end of the first side board 10, a first end of the second side board 20, a first end of the third side board 30, and a first end of the fourth side board 40. Referring to FIG. 1, the first box cover 1200 is located on an upper end of the box body 1100.

The first board 100 is disposed with a first connector 130 having a self-closing function. The first connector 130 is configured to be changed between an unfolded position and a folded position. The number of first connectors 130 can be set to any number, such as between 1 and 10, but is not limited in this regard.

In this embodiment, the first connector 130 is disposed on a top edge of the first board 100. The first connector 130 comprises a first connector body 110 and a first folding portion 120 fixedly connected to a side of the first connector body 110. The first connector body 110 and the first folding portion 120 define an L-shaped structure when the first connector 130 is in the folded position. Alternatively, the first connector body 110 and the first folding portion 120 define a T-shaped structure when the first connector 130 is in the folded position. The specific shape of the first connector 130 is not limited in this regard, and any shape of the first connector 130 that enables the first connector 130 to be smoothly inserted into a first insertion hole 310 of the second inner lining board 300 can be used. The first connector 130 can also be alternatively disposed on any one of the first inner lining board 200, the second inner lining board 300, or the third inner lining board 400, and is not limited in this regard.

The first folding portion 120 of the first connector 130 is not connected to the first board 100 to define a free end.

The second inner lining board 300 comprises the first insertion hole 310 configured to be matched with (i.e., correspond to) the first connector 130 when the first connector 130 is in the folded position. When a first end (i.e., the upper end) of the box body 1100 needs to be sealed, it only necessary that each of the first inner lining board 200, the second inner lining board 300, and the third inner lining board 400 cover the first end of the box body 1100, then the first connector 130 is changed to the folded position and inserted into the box body 1100 through the first insertion hole 310, so that the first board 100 covers the first end of the box body 1100. Finally, the first connector 130 is automatically unfolded to the unfolded position so as to be clamped to the first insertion hole 310 to perform the self-closing function.

The first insertion hole 310 can be L-shaped; a long side section of the first insertion hole 310 corresponds to the first connector body 110, and a short side section of the first insertion hole 310 corresponds to the first folding portion 120. The shape of the first insertion hole 310 is not limited in this regard and matches the shape of the first connector 130 when in the folded position. If the first connector body 110 and the first folding portion 120 define a T-shaped structure when the first connector 130 is in the folded position, the first insertion hole 310 can also be T-shaped. The number of the first insertion holes 310 can also be set to any number, such as between 1 and 10, but is not limited in this regard. The first insertion hole 310 can also be disposed on the first side board 10, the second side board 20, the third side board 30, or the fourth side board 40.

In this embodiment, a width of the short side section of the first insertion hole 310 is shorter than a width of the first folding portion 120 of the first connector 130 when the first folding portion 120 is unfolded. The width of the short side section of the first insertion hole 310 is shorter than the width of the first folding portion 120 of the first connector 130 when the first folding portion 120 is unfolded so that the first folding portion 120 can be clamped on a bottom wall of the first insertion hole 310 when the first folding portion 120 is unfolded. As a result, the first board 100 cannot be opened from the outside of the self-closing packaging box 1000, and therefore the self-closing packaging box 1000 cannot be opened.

In this embodiment, the first connector 130 has a shape of a cube. In some embodiments, the first connector 130 has the shape of a cuboid, a sphere, a triangle, a trapezoid, or a combination of these shapes.

In this embodiment, the first inner lining board 200 and the third inner lining board 400 are respectively disposed with first space-providing grooves 210, 410, and the first space-providing grooves 210, 410 are disposed opposite to each other and each correspond to the first insertion hole 310.

In this embodiment, the third side board 30 comprises an unlocking hole 31. The number of unlocking holes 31 is the same as the number of first insertion holes 310, and the unlocking hole 31 corresponds to the first insertion hole 310. When a finger of a user finger moves into the unlocking hole 31 to fold the first folding portion 120, the user pulls out the first connector 130 from the first insertion hole 310, and the first board 100 can be opened from the first end of the box body 1100 to uncover the first end of the box body 1100. Therefore, there is no need to destroy the entire self-closing packaging box 1000 when opening the self-closing packaging box 1000, and the self-closing packaging box 1000 which has been opened can be reused.

In this embodiment, the unlocking hole 31 is disposed with a connecting piece 32, and the connecting piece 32 and the unlocking hole 31 are connected by a point-breaking structure 33. When opening the self-closing packaging box 1000, the connecting piece 32 is separated from the unlocking hole 31 by the point-breaking structure 33. At this time, the finger of the user can open the self-closing packaging box 1000 through the unlocking hole 31, and an integrity of the self-closing packaging box 1000 can be ensured when the self-closing packaging box 1000 is not opened. Referring to FIG. 6, the unlocking hole 31 has a quadrilateral shape, and the connecting piece 32 has a quadrilateral shape corresponding to the unlocking hole 31. Alternatively, the unlocking hole 31 may have a circular or triangular shape, and a shape of the connecting piece 32 is the same as that of the unlocking hole 31.

In this embodiment, the second box cover 1300 comprises a second board 500, a sixth inner lining board 600, a seventh inner lining board 700, and an eighth inner lining board 800, which are respectively connected to a second end of the third side board 30, a second end of the fourth side board 40, a second end of the first side board 10, and a second end of the second side board 20. Referring to FIG. 3, the second box cover 1300 covers a lower end of the box body 1100.

The second board 500 is disposed with two second connectors 530 having a self-closing function. The two second connectors 530 are configured to be changed between an unfolded position and a folded position. The two second connectors 530 are respectively disposed on a left side and a right side of the second board 500, and each of the two second connectors 530 comprises a second connector body 510 and a second folding portion 520 fixedly connected to a side of the second connector body 510. The second connector body 510 and the second folding portion 520 define an L-shaped structure when each of the two second connectors 530 is in the folded position. Each of the two second connectors 530 is the same as the first connector 130.

The sixth inner lining board 600 and the eighth inner lining board 800 are respectively disposed with second insertion holes 610, 810, which are configured to be respectively matched with the two second connectors 530 when in the folded position. When a second end (i.e., the lower end) of the box body 1100 needs to be sealed, it is only necessary that each of the sixth inner lining board 600, the seventh inner lining board 700, and the eighth inner lining board 800 cover the second end of the box body 1100, then the two second connectors 530 are changed to the folded position and respectively inserted into the box body 1100 through the second insertion holes 610, 810, so that the second board 500 covers the second end of the box body 1100. Finally, the two second connectors 530 are automatically unfolded to the unfolded position to be clamped to the second insertion holes 610, 810 to perform the self-closing function. Each of the second insertion holes 610, 810 is the same as the first insertion hole 310.

A left end and a right end of the seventh inner lining board 700 are respectively disposed with two second space-providing grooves 710, and the two second space-providing grooves 710 respectively correspond to the second insertion holes 610, 810.

The second insertion holes 610, 810 can be L-shaped; a long side section of each of the second insertion holes 610, 810 corresponds to the second connector body 510, and a short side section of each of the second insertion holes 610, 810 corresponds to the second folding portion 520. In this embodiment, a width of the short side section of each of the second insertion holes 610, 810 is shorter than a width of the second folding portion 520 of each of the two second connectors 530 when the second folding portion 520 is unfolded.

When the self-closing packaging box 1000 needs to be sealed, it is only necessary to initially enable the second box cover 1300 to cover the box body 1100, and then enable the first box cover 1200 to cover the box body 1100.

A specific packaging process is as follows:

The sixth inner lining board 600 and the eighth inner lining board 800 are initially turned inwardly to be disposed opposite to each other, and then the seventh inner lining board 700 is turned inwardly to be stacked on the sixth inner lining board 600 and the eighth inner lining board 800. At this time, the two second space-providing grooves 710 respectively correspond to the second insertion holes 610, 810. Then, the second folding portion 520 is folded to enable the second connector body 510 and the second folding portion 520 to define the L-shaped structure. Then, while the two second connectors 530 are maintained in the folded position, the second board 500 is turned inwardly until the two second connectors 530 are inserted into the second insertion holes 610, 810. At this time, the second board 500 is stacked on the seventh inner lining board 700, and the second folding portions 520 of the two second connectors 530 are automatically unfolded to be clamped to inner walls of the second insertion holes 610, 810 so as to perform the self-closing function on the lower end of the box body 1100. Thereby, the second box cover 1300 covers the box body 1100.

Then, the first inner lining board 200 and the third inner lining board 400 are turned inwardly to be disposed opposite to each other. At this time, the first space-providing grooves 210, 410 are connected to define a space (i.e., a large space).

Then, the second inner lining board 300 is turned inwardly to be stacked on the first inner lining board 200 and the third inner lining board 400, and the first insertion hole 310 corresponds to the first space-providing grooves 210, 410. Then, the first folding portion 120 is folded to enable the first connector body 110 and the first folding portion 120 to define the L-shape structure. Then, while the first connector 130 is maintained in the folded position, the first board 100 is turned inwardly until the first connector 130 is inserted into the first insertion hole 310. At this time, the first board 100 is stacked on the second inner lining board 300, and the first folding portion 120 is automatically unfolded to be clamped to an inner wall of the first insertion hole 310 so as to perform the self-closing function on the upper end of the box body 1100. Thereby, the first box cover 1200 covers the box body 1100.

When unpacking is required, a specific unpackaging process is as follows:

The position of the connecting piece 32 is found, three sides of the connecting piece 32 are separated from three sides of the unlocking hole 31 through the point-breaking structure 33, and then the connecting piece 32 is turned outward to expose the unlocking hole 31. At this time, the finger of the user is moved into the unlocking hole 31 to fold the first folding portion 120 to enable the first connector body 110 and the first folding portion 120 to define the L-shaped structure, the first connector 130 is pulled out of the first insertion hole 310, and the first box cover 1200 is opened. After unpackaging, the self-closing packaging box 1000 is still intact and can be reused. Since the self-closing packaging box 1000 can only be unlocked through the unlocking hole 31, if the connecting piece 32 is damaged, it can be determined whether the self-closing packaging box 1000 has been previously unpackaged.

Referring to FIGS. 7 to 10, a self-closing packaging box 1000 of a second embodiment is provided.

In this embodiment, the first box cover 1200 is the same as the first box cover 1200 of the first embodiment and will not be described.

The difference between this embodiment and the first embodiment is as follows.

A top end of the second board 500 is disposed with a second connector 530, and the seventh inner lining board 700 is disposed with a second insertion hole 720 corresponding to the second connector 530. The sixth inner lining board 600 and the eighth inner lining board 800 are respectively disposed with second space-providing grooves 620, 820. When the second space-providing grooves 620, 820 are disposed oppositely, a space (i.e., a large space) is defined by the second space-providing grooves 620, 820. The space corresponds to the second insertion hole 720.

When the second box cover 1300 covers the box body 1100, the sixth inner lining board 600 and the eighth inner lining board 800 are initially turned inwardly to be disposed opposite to each other. At this time, the second space-providing grooves 620, 820 are connected to define the space. Then, the seventh inner lining board 700 is turned inwardly to be stacked on the sixth inner lining board 600 and the eighth inner lining board 800. At this time, the second space-providing grooves 620, 820 each correspond to the second insertion hole 720. Then, the second folding portion 520 is folded to enable the second connector body 510 and the second folding portion 520 to define the L-shaped structure. Then, while the second connector 530 is maintained in the folded position, the second board 500 is turned inwardly until the second connector 530 is inserted into the second insertion hole 720. At this time, the second board 500 is stacked on the seventh inner lining board 700, and the second folding portion 520 is automatically unfolded to be clamped to an inner wall of the second insertion hole 720 to perform the self-closing function on the lower end of the box body 1100. Thereby, the second box cover 1300 covers the box body 1100.

In this embodiment, two connecting pieces 32 are provided and disposed on an upper side and a lower side of the box body 1100. The two connecting pieces 32 respectively correspond to the first connector 130 and the second connector 530, which are inserted into the box body 1100.

This second box cover 1300 of the second embodiment has a simpler structure than the second box cover 1300 of the first embodiment, and the packaging and unpackaging processes are more convenient. However, a sealing performance of the self-closing packaging box 1000 of the second embodiment is worse than that of the first embodiment.

Referring to FIGS. 11 to 13, a self-closing packaging box 1000 of a third embodiment is provided.

In this embodiment, the second box cover 1300 is the same as the second box cover 1300 of the first embodiment and will not be described.

The difference between this embodiment and the first embodiment is as follows.

A left side and right side of the first board 100 are each disposed with a first connector 130. A first insertion hole 220 is disposed between the first inner lining board 200 and the second side board 20, and a first insertion hole 420 is disposed between the third inner lining board 400 and the fourth side board 40. A left side and right side of the second inner lining board 300 are each disposed with a first space-providing groove 320, and the two first space-providing grooves 320 respectively correspond to the first insertion holes 220, 420.

At the same time, the second side board 20 and the fourth side board 40 are each disposed with an unlocking hole 31, and the two unlocking holes 31 respectively correspond to the two first connectors 130, which are inserted into the first insertion holes 220, 420. The finger of the user is moved into the two unlocking holes 31 to achieve unlocking. Two connecting pieces 32 are respectively disposed on the two unlocking holes 31, and the two connecting pieces 32 and the two unlocking holes 31 are connected by the point-break structure 33.

Referring to FIGS. 14 to 16, a self-closing packaging box 1000 of a fourth embodiment is provided.

In this embodiment, the top edge of the first board 100 is disposed with a first connector 130, and the second inner lining board 300 is disposed with a first insertion hole 310. The first inner lining board 200, the second inner lining board 300, and the third inner lining board 400 are not disposed with space-providing grooves. Widths of the first inner lining board 200 and the third inner lining board 400 are reduced, and a sum of the widths of the first inner lining board 200 and the third inner lining board 400 is shorter than a length of the third side board 30, so that a space is defined between the first inner lining board 200 and the third inner lining board 400 and corresponds to the first insertion hole 310. The space can provide space to the first connector 130 when the first connector 130 is inserted into the first insertion hole 310.

In this embodiment, the first connector 130 comprises a first connector body 110 and one or two first folding portions 120 connected to the side of the first connector body 110. When the first connector 130 is in the folded position, the first connector body 110 and the one or two first folding portions 120 define a linear-shaped structure. The first insertion hole 310 has a linear shape. The first connector body 110 is fixedly connected to the top edge of the first board 100, and the one or two first folding portions 120 are not connected to the first board 100 to define a free end. Referring FIG. 14, the one or two first folding portions 120 are two first folding portions 120, and the two first folding portions 120 are respectively connected to a left side and a right side of the first connector body 110. The two first folding portions 120 on the left side and the right side of the first connector body 110 are folded inwardly to a front side of the first connector body 110 and are maintained in close contact with the front side of the first connector body 110. At this time, the first connector 130 defines the linear-shaped structure, and then the first connector 130 is inserted into the first insertion hole 310 to define an insertable connection between the first connector 130 and the first insertion hole 310. After the first connector 130 is inserted into the first insertion hole 310, the two first folding portions 120 can be unfolded outwardly so that a length of the first connector 130 is greater than a length of the first insertion hole 310 to realize the self-closing function of the first box cover 1200.

Referring to FIG. 14, the unlocking hole 31 and the connecting piece 32 are each arranged on the second inner lining board 300 near the first insertion hole 310.

The second box cover 1300 is the same as the first box cover 1200.

It will be apparent to those skilled in the art that various modifications and variation can be made in the present disclosure without departing from the spirit or scope of the disclosure. Thus, it is intended that the present disclosure cover the modifications and variations of this disclosure provided they come within the scope of the appended claims and their equivalents. 

What is claimed is:
 1. A self-closing packaging box, comprising: a box body, a first box cover, and a second box cover, wherein: the first box cover and the second box cover respectively cover two ends of the box body, the box body comprises a first side board, a second side board, a third side board, and a fourth side board, which are sequentially connected, the first box cover comprises a first board, a first inner lining board, a second inner lining board, and a third inner lining board, which are respectively connected to a first end of the first side board, a first end of the second side board, a first end of the third side board, and a first end of the fourth side board, the first board is disposed with one or more first connectors, the one or more first connectors are configured to be changed between an unfolded position and a folded position, at least one of the first inner lining board, the second inner lining board, or the third inner lining board comprises one or more first insertion holes configured to be matched with the one or more first connectors when the one or more first connectors are in the folded position, and when a first end of the two ends of the box body is to be sealed: each of the first inner lining board, the second inner lining board, and the third inner lining board are configured to cover the first end of the box body, the one or more first connectors are then configured to be changed to the folded position and inserted into the box body through the one or more first insertion holes so that the first board covers the first end of the box body, and the one or more first connectors are automatically unfolded to the unfolded position to be clamped to the one or more first insertion holes to perform a self-closing function.
 2. The self-closing packaging box according to claim 1, wherein: the one or more first connectors are two first connectors, the two first connectors are respectively disposed on a left side and a right side of the first board, the one or more first insertion holes are two first insertion holes, a first of the two first insertion holes is disposed between the first inner lining board and the first side board, a second of the two first insertion holes is disposed between the third inner lining board and the fourth side board, two first space-providing grooves are respectively disposed on a left end and right end of the second inner lining board, and the two first space-providing grooves respectively correspond to the two first insertion holes.
 3. The self-closing packaging box according to claim 1, wherein: the one or more first connectors is a first connector, the first connector is disposed on a top edge of the first board, the one or more first insertion holes is a first insertion hole, the first insertion hole is disposed between the second inner lining board and the third side board, a first of two first space-providing grooves is disposed between the first inner lining board and the second side board, a second of the two first space-providing grooves is disposed between the third inner lining board and the fourth side board, and when the two first space-providing grooves are disposed opposite to each other, the two first space-providing grooves each correspond to the first insertion hole.
 4. The self-closing packaging box according to claim 1, wherein: each of the one or more first connectors comprises a first connector body and a first folding portion fixedly connected to a side of the first connector body, each of the one or more first insertion holes is L-shaped and has a long side section and a short side section, and when the one or more first connectors are in the folded position: the first connector body and the first folding portion define an L-shaped structure, the long side section of a corresponding one of the one or more first insertion holes corresponds to the first connector body, and a short side section of a corresponding one of the one or more first insertion holes corresponds to the first folding portion.
 5. The self-closing packaging box according to claim 4, wherein: a width of the short side section of each of the one or more first insertion holes is shorter than a width of the first folding portion when the first folding portion is unfolded.
 6. The self-closing packaging box according to claim 1, wherein: the one or more first connectors have a shape of a cube, a cuboid, a sphere, a triangle, a trapezoid, or a combination of these shapes.
 7. The self-closing packaging box according to claim 1, wherein: one or more unlocking holes are disposed on at least one of the first side board, the second side board, the third side board, or the fourth side board, the number of the one or more unlocking holes is the same as at least one of the number of the one or more first connectors or the number of the one or more first insertion holes, and the one or more unlocking holes respectively correspond to the one or more first insertion holes.
 8. The self-closing packaging box according to claim 7, wherein: the one or more unlocking holes are disposed with a connecting piece, and the one or more unlocking holes and the connecting piece are connected by a point-breaking structure.
 9. The self-closing packaging box according to claim 1, wherein: the second box cover comprises a second board, a sixth inner lining board, a seventh inner lining board, and an eighth inner lining board, which are respectively connected to a second end of the third side board, a second end of the fourth side board, a second end of the first side board, and a second end of the second side board, the second board is disposed with one or more second connectors, the one or more second connectors are configured to be changed between the unfolded position and the folded position, at least one of the sixth inner lining board, the seventh inner lining board, or the eighth inner lining board comprises one or more second insertion holes configured to be matched with the one or more second connectors when the one or more second connectors are in the folded position, and when a second end of the two ends of the box body is to be sealed: each of the sixth inner lining board, the seventh inner lining board, and the eighth inner lining board are configured to cover the second end of the box body, the one or more second connectors are then configured to be changed to the folded position and inserted into the box body through the one or more second insertion holes so that the second board covers the second end of the box body, and the one or more second connectors are automatically unfolded to the unfolded position to be clamped to the one or more second insertion holes to perform the self-closing function.
 10. The self-closing packaging box according to claim 1, wherein: the one or more first connectors is a first connector, the first connector is disposed on a top edge of the first board, the one or more first insertion holes is a first insertion hole, the first insertion hole is disposed on the second inner lining board, a sum of widths of the first inner lining board and the third inner lining board is shorter than a length of the third side board, and a space is defined between the first inner lining board and the third inner lining board and corresponds to the first insertion hole.
 11. The self-closing packaging box according to claim 10, wherein: the first connector comprises a first connector body and a first folding portion connected to a side of the first connector body, the first insertion hole is linear-shaped, and when the first connector is in the folded position, the first connector body and the first folding portion define a linear-shaped structure.
 12. The self-closing packaging box according to claim 11, wherein: the first connector body is fixedly connected to the top edge of the first board, and the first folding portion is not connected to the first board to define a free end.
 13. The self-closing packaging box according to claim 4, wherein: the first connector body is fixedly connected to the first board, and the first folding portion is not connected to the first board to define a free end.
 14. A self-closing packaging box, comprising: a box body, a first box cover, and a second box cover, wherein: the first box cover and the second box cover respectively cover two ends of the box body, the box body comprises a first side board, a second side board, a third side board, and a fourth side board, which are sequentially connected, the first box cover comprises a first board, a first inner lining board, a second inner lining board, and a third inner lining board, which are respectively connected to a first end of the first side board, a first end of the second side board, a first end of the third side board, and a first end of the fourth side board, the first board is disposed with one or more first connectors, the one or more first connectors are configured to be changed between an unfolded position and a folded position, at least one of the second side board, the third side board, or the fourth side board comprises one or more first insertion holes configured to be matched with the one or more first connectors when the one or more first connectors are in the folded position, and when a first end of the two ends of the box body is to be sealed: each of the first inner lining board, the second inner lining board, and the third inner lining board are configured to cover the first end of the box body, the one or more first connectors are then configured to be changed to the folded position and inserted into the box body through the one or more first insertion holes so that the first board covers the first end of the box body, and the one or more first connectors are automatically unfolded to the unfolded position to be clamped to the one or more first insertion holes to perform a self-closing function.
 15. The self-closing packaging box according to claim 2, wherein: each of the two first connectors comprises a first connector body and a first folding portion fixedly connected to a side of the first connector body, each of the two first insertion holes is L-shaped and has a long side section and a short side section, and when the two first connectors are in the folded position: the first connector body and the first folding portion define an L-shaped structure, the long side section of a corresponding one of the one or more first insertion holes corresponds to the first connector body, and a short side section of a corresponding one of the one or more first insertion holes corresponds to the first folding portion.
 16. The self-closing packaging box according to claim 3, wherein: the first connector comprises a first connector body and a first folding portion fixedly connected to a side of the first connector body, the first insertion hole is L-shaped and has a long side section and a short side section, and when the first connector is in the folded position: the first connector body and the first folding portion define an L-shaped structure, the long side section of the first insertion hole corresponds to the first connector body, and a short side section of the first insertion hole corresponds to the first folding portion.
 17. The self-closing packaging box according to claim 15, wherein: a width of the short side section of each of the two first insertion holes is shorter than a width of the first folding portion when the first folding portion is unfolded.
 18. The self-closing packaging box according to claim 16, wherein: a width of the short side section of the first insertion hole is shorter than a width of the first folding portion when the first folding portion is unfolded.
 19. The self-closing packaging box according to claim 15, wherein: the first connector body is fixedly connected to the first board, and the first folding portion is not connected to the first board to define a free end.
 20. The self-closing packaging box according to claim 16, wherein: the first connector body is fixedly connected to the first board, and the first folding portion is not connected to the first board to define a free end. 